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WP_REST_Request::canonicalize_header_name( string $key )

Canonicalizes the header name.

Ensures that header names are always treated the same regardless of source. Header names are always case insensitive.

Note that we treat - (dashes) and _ (underscores) as the same character, as per header parsing rules in both Apache and nginx.

(string) Canonicalized name.

public static function canonicalize_header_name( $key ) {
		$key = strtolower( $key );
		$key = str_replace( '-', '_', $key );

		return $key;
	}

Used By	Description
wp-includes/rest-api/class-wp-rest-request.php: WP_REST_Request::get_header_as_array()	Retrieves header values from the request.
wp-includes/rest-api/class-wp-rest-request.php: WP_REST_Request::set_header()	Sets the header on request.
wp-includes/rest-api/class-wp-rest-request.php: WP_REST_Request::add_header()	Appends a header value for the given header.
wp-includes/rest-api/class-wp-rest-request.php: WP_REST_Request::remove_header()	Removes all values for a header.
wp-includes/rest-api/class-wp-rest-request.php: WP_REST_Request::get_header()	Retrieves the given header from the request.

Version	Description
4.4.0	Introduced.